all I needed to hear was one person saying its okay to vent to atmosphere, now I'm gonna buy one

so when venting to atmosphere the mixture becomes rich meaning not all of the fuel will be burnt dumping un-burnt fuel to the exhaust where if sufficiently heated may cause it to reignite.... AKA shooting dank ass flames

I'm liking this new series and how technical it is. As mentioned in the video, it's good to get a professional opinion that isn't some bloke on a forum site.

The answer is yes. I recommend getting a GFB TMS respons hybrid BOV so that way you can vent whatever percentage you want and won't trigger a check engine light

The absolute best thing you can do is, get an adjustable one, when you’re racing keep it closed and when you go to a meet, open it up.

Thank you Go Fast Brett!! Always a delight to devour your knowledge!!

Venting to atmosphere sounds so much better though

fun fact, Brett means Wide in Swedish, so go fast Brett in Swenglish translates to Go fast Wide, as in when you drift. or "åka på tvären" as we say here. great series btw

This was the most informative video I’ve ever watched on KZfaq re - BOV. Top job mate 👍👍👍

Go fast brett, shutting down forum know it alls. Love it.

Awesome video guys, love that you are helping to clarify issues you've found on the internet with people that actually know what they are talking about!! I was just wondering if you could clarify how you would go about determining the correct spring tension for your b.o.v in order to not cause stalling or backfiring. I.e how do you go about setting it up correctly ?? Cheers And love the videos !!

Good information and friendly as always. Thank you, Mr. Brett :)

I love the nerdery of this series. It's so good.

I've been trying to figure this out for 5 hours today and finally stumbled on this video. I have a 2014 Jetta GLI Autobahn (GEN3) and the forums are just like you said. Looking for a dual port valve now. Thanks

so happy this show is still going I love the GFB series so informative!

This was great and very informative, thanks Brett and GFB!

That 2 port blow off value was the best item I purchased for my rexy. Made the best sounds, and when I got pulled over, I just quickly turned it to 100% recirculation and got away defect free :)

This guy is amazing, very good information and explained well, thanks for the wisdom mate, appreciate it!

Thank you for clearing this up with actual knowledge

i'd like to see a follow up of this covering the differences between EFI systems using MAP sensors instead of MAF sensors and also Blow through Carby setups.

I did ecu tune , down pipe , bmc filter and renntech bov for my amg gts , but it still runs like a stock amg gts just a bit faster. Is it because of bov

Great video. Very intelligent, and excellent message delivery. Subed, hope to see more.

This guys explains it nicely. Thanks Brett.

Perhaps you could walk us through how this would affect an engine running without an air flow meter? Like with aftermarket ECUs and some OEM's, like Saab Trionic 5. Since these systems doesn't calculate fuel based on air flow, surely they respond differently to the use of atmospheric BOV's?

Intestine video! On the turbo system that's on my Focus, the blow off valve is before the MAF so it makes no difference to idle or AFR when I vent to atmosphere. I'm also using an OEM diverter valve off of an Audi, and seems to work just fine as well. But of course, I specifically designed the system to have all of the venting stuff before the MAF so I could avoid all of these problems. But I don't know if most OEM turbo systems work that way, so probably trust Brett ;)

Thanks for this info! Very Helpfull!

Good video I found it was just easy to move the maff after the blow off valve that way the air that is being discharged never passes threw the mass air but yes most GM that I tune have DFCO deceleration fuel cut off as soon as your foot leaves the pedal your AFR is flat lined shutting off fuel. When tuning even in open loop with DFCO disabled still don’t see rich conditions even if so a little extra fuel will keep them cylinders cool lol thanks for the info brother God Bless

Best explanation video around!

Brett. You mentioned a MAF sensor set up but didn't mention a MAP sensor set up. Is there a difference?

So an adjustable blow off valve apparantly allows to tune how many flames you shoot out? I love it

go fast Brett I need your help, I'm planing on upgrading my stock wga to an aftermarket one (2008 caliber SRT 4) should I delete the solenoid valve to my wga?

Hey Brett, I've got an S15 which has been tuned with an atmospheric venting BOV on it. I want to get an adapter for it to make it into a recirculating BOV to get rid of the backfiring. Would I need to/benefit from getting the car re-tuned?

Great video and topic.

Thanks Brett. 👍

Awesomely explained.

Can you do a video on running mafless and what benefits it has.

Awesome explanation!!thank you!!

Can you do a video on turbo surging as I hear many people do it but I also hear that it can damage the turbo

So how do I figure out how hard or soft the BOV should be for my mazdaspeed3?

How would Mechanical fuel injection like K-jetronic react to the different bov/bpv's ?

Thank you for talking sense!

Fantastic video, thank you :)

bwaaaaaaaa sutututu

"I'm not here to debate that right now" well said Brett.

I still have questions about using my factory recirc bov to vent to atmo.... as long as I blank off the hole left in the low pressure side of the intake, I should be okay, right? As the BOV must by design be closed whenever I’m on boost otherwise there’d be a leak in the system, and no boost....

what's the correct way to set the spring pre-load on the BOV? doesn't venting or recirculation depend on the way the car reads air (MAP sensor vs. MAF sensor)? thanks Brett

Do you have any installation vids on the tt legacy setup ?

How old is that Dell laptop

wow thank you for this video, super helpful

How to set up the spring load right? I have a twin turbo Subaru ej208

I have a 2013 wrx it's stock and wtb bov would it affect problems in the long run for me ?

What about relocating the MAF after the BOV? Would that be a better solution?

One thing I wish were in the video was talking about the autocorrect aspect in most oem ecu's. Factory ecu's usually adjust the mixture a tiny bit if it thinks that the mixture is too lean or rich and it's usually just an adaptation factor and once it reaches a set percent it will cause a CEL. eg. ~15% in Saab's . Could a BOV be enough? (I kind of doubt it unless you drive really erratically) So mostly you'll get it for various other reasons, eg. an air leak. But could a bov cause it?

missed this so much

Can confirm Turbo falcons can go full atmospheric Bov without issues

I've a question about when the ecu cuts fuel when you close the throttle. Is it really cutting all fuel? How long have they been doing this? so on and so forth.

So how do i run my car that has an in cab remote to adjust open or closed without stalling? I have gfb was already installed on my car when i bought it and when its 50/50 and over it stalls :(

I have a question How do i know, that the blow off valve it's set up correct ? if i take my diesel car and put a valve on it, when do i know the setup it's wrong. You say it can makes a back fire, if it's setup wrong, so do i need to set the valve on it, og adjusting after what it sounds right ? It's maybe a dump question, but just to learn more. But a great video, just what i wanted.

If you run a MAP sensor rather then MAF you won't experience lean conditions ! Surprised this wasn't mentioned.

So bov can cause backfire, and loud whoosh sound? He talked me into it.

so i have a DV, what does it take to switch to a BOV?

Thanks you solved my problem Brett Happy Easter My Doggy!!!!

Can I get the same PSHHH sound from a DV+ and from a Forge Blow Off Valve?

I just got the twin turbo explorer sport- Can I install a m.a.p sensor in place of m.a.f and then vent both b.o.v's?

i've got the gfb dv+ installed together with a forge spacer..i know the gfb is good on its own but i wanted abit if turbo bov sound is it ok to combine the too am i losing to much boost?

Speed density carries the day yet again!

How do you achieve flutter? By unplugging the factory bov so that it doesn't operate?

Does GFB product still on sale outside Aussie?

This is only the case if the MAF sensor is bevore the BOV or not? My MAF sensor is behinde the BOV,.

I think my blow off might be saving my clutch right now since im not constantly running boost on my Si with this +6 tune

yeah but what if we plumb it back into the exhaust manifold, just before the turbo? is that a defect?

what if you're not using the stock ecu and tuning your fuel using a wide band and MAP instead of monitoring air intake pre-turbo? I'd imagine atmospheric would not be an issue.

What if the BOV is before the AFM ;)

How about a sound plate? Using the oem recirculation valve? Is that bad?

Hey @gfbvideos I would love to see a simple machined block off plate for the OEM GD STI intercooler. Or just an added plug that fit's your adapter plate so I can plug off the OEM BOV location. Can't seem to find anyone that makes one online.

i had that on my evo 8 and i vented it about 50/50 i was tuned with gsc1 or gcs1 cams cant remember down pipe straight pipe cat back intake upper and lower inter cooler piping and the car ran fine with it my evo x is stock so i don't know how that bov would be on the x

What about turbo bark?

What about diverter valve spacers? Will they have idle problems sense they use the factory dv?

So you explained cars with a mass flow meter , but what about cars with map sensors? I've been told by the interweb it does nothing . Yet my entire car group points out a little drop in fuel milage . We've all tossed it up to bad habit of wanting to hear the vent to atmosphere lol . But can it be something more ? Especially since turbo smart just released a bov specifically designed for the Hyundai gamma turbo motors

What about a spacer on the diverter? Cause any problems?

Can anyone recommend the correct/best ratio for a 2020 wrx sti? Also how tigh should the spring load be? Tia

if your bov was before your air sensors wouldn't it eliminate the rich problem? since it would be regulating the mixture according to the "true" air input.

no mention of part throttle i.e on track cars mid corner, as i had overfuling issue on my mx5/miata turbo before i went with a stand alone MAP based ecu.

I have a GFB Respons installed on my Impreza... really nice valve!

How do you know if you got the spring preload right on a Kia Cerato gt?

What would the correct ratio be for a 2021 Hyundai i30n premium DCT if I want to vent to atmosphere? Any recommendations? I just brought one of these BOVs

Do you need tune to your 2012 Subaru wrx premium when installing this type blow off valve?

Anything for a 2012 R58 Coupe JCW?

directly .. is there any risk whatsoever to the engine when installing a flush? for example, in a jetta 1.4 2016? Thank you

so i was wondering a turbo stops spooling when the wastegate opens but what if there was no wastegate in the turbine but there would be one in the pump side when the car needs boost its always there because the turbine is always spooled

Does Go Fast Brett have a business name?Another excellent video from Brett.

Hey Brett, Thankyou for your well informed snippets, I enjoy watching your educated blogs, (and the MCM Legends) but dude....... Iron your new T shirts when in front of half a million subscribers ! Lmao :)

after installing 300zx maf on sr20det and dumping to atmosphere my engine actually stalls anytime it dumps to atmosphere,the fix was recirculating but now i have no bov sound. do you think the dual port will give me best of both worlds where i can keep maf happy enough to not stall and also retain bov sound?

I have a sr20det and it's only running 4psi of boost when I was getting 7. What could be my problem?

What is legal for the roads? (NSW but interested across Aus)

Is it possible to increase the boost if you have the latest tech diesel car with a electronic stepper motor that moves the waste gate

Will this fit my Honda?

time to run a bov venting to atmosphere on my draw through carby setup.

How do you know when it is set up right then?

This totally missed out on factoring in cars that do not run a MAF/AFM.